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The best spot I've found to hide my buddies is behind the drivers seat in the compartment where the factory subwoofer goes (this only works with non-Bose models). Just pop off the cover with a screw driver and u have maaaad space to hide almost anything you want. It is such a good spot that I would be 100% confident in hiding anything in there and having anyone try and search my car to find it.
The center console, flip the lid up and at the way back where the two arms go in there is a plastic rectangle peice that pops out, you can fit a few zip-ties in there. I'm pretty sure Z's have this also, but this is the best place I've found in the G's due to it's stealth and accesibility.
since i dont have boss system, where the "stock sub" goes, they have just a plastic panel piece to cover it, i pry it out with a penny and hide stuff in there, put the cover on it. no one is the wise